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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Operating activities    
Net loss $ (74,656) $ (190,098)
Adjustments to reconcile net loss to net cash used in operating activities:    
Loss on forward sale of Series B Preferred Stock 0 60,081
Loss on bridge loans 0 13,719
Stock-based compensation expense 13,123 14,880
Amortization of developed technology 11,200 11,528
Depreciation and amortization 3,980 3,499
Provision for excess and obsolete inventory 1,496 7,874
Impairment of InstruNor developed technology intangible 0 3,526
Amortization of debt discounts, premiums and issuance costs 770 830
Other non-cash items (987) 273
Changes in assets and liabilities:    
Accounts receivable, net (2,991) 1,063
Inventories, net (4,914) (8,470)
Prepaid expenses and other assets 960 33
Accounts payable 1,618 (2,776)
Accrued compensation and related benefits 3,018 4,113
Deferred revenue 884 (3,467)
Other liabilities 3,212 (5,978)
Net cash used in operating activities (43,287) (89,370)
Investing activities    
Purchases of short-term investments (94,896) (137,302)
Proceeds from sales and maturities of investments 117,964 53,000
Purchases of property and equipment (2,831) (3,825)
Net cash provided by (used in) investing activities 20,237 (88,127)
Financing activities    
Proceeds from bridge loans 0 25,000
Proceeds from issuance of Series B Preferred Stock 0 225,000
Repayment of term loan and advances under revolving credit facility (2,083) (6,838)
Payment of debt and equity issuance costs 0 (12,547)
Repurchase of common stock (5,414) (563)
Proceeds from ESPP stock issuance and exercise of stock options 827 917
Payments for taxes related to net share settlement of equity awards and other (139) (211)
Net cash provided by (used in) financing activities (6,809) 230,758
Effect of foreign exchange rate fluctuations on cash and cash equivalents 34 (404)
Net increase (decrease) in cash, cash equivalents and restricted cash (29,825) 52,857
Cash, cash equivalents and restricted cash at beginning of period 82,324 29,467
Cash, cash equivalents and restricted cash at end of period 52,499 82,324
Supplemental disclosures of cash flow information    
Cash paid for interest 3,819 3,493
Cash paid for income taxes, net of refunds 801 309
Non-cash right-of-use assets and lease liabilities 629 651
Asset retirement obligations $ 758 $ 718